Improvement in mortising-machine



UNITED STATns ATENT ErroriA D. L. GIBBS, OF WORCESTER, MASSACHUSETTS,ASSIGNOR TO It. BALL & CO., OF SAME PLACE.

Specification forming part of Letters Patent No. 84,817, datedecember 8,1868.

Know all man by these presents That I, D. L. GIBBs, of the city andcounty of Worcester, and Commonwealth of Massachusetts, have inventedcertain new and useful Improvements in Mortising-Maehines; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings, forming a part of this specification, in which- Figure lrepresents a front view of my improvements in mortising-machines. Fig. 2represents a view of the right-hand side of the same. Fig. 3 representsa horizontal section of the chisel-arbor at line A on Fig. 1. Fig. 4represents a horizontal section of the chiselarbor at line B on Fig. 1.Fig. 5 represents a plan view of the treadle and catch-lever separatefrom the machine, vshowing their relative positions; and Fig. 6represents a section through main frame A, showing the manner of hangingthe weight for raising the treadle.

To enable others skilled in the art to which my invention belongs tomake and use the same, I will proceed to describe it'more in detail.

The nature of my invention consists, rst, in the peculiar construction,combination, and arrangement of the treadle and catch-bar; second, inthe combination and relative arrangement of the treadle devices anddevices for elevating and depressing the table, as will be hereafterexplained; third, in the peculiar construction, combination, andarrangement of device for turning the chisel and holding it in position5 fourth, inthe peculiar construction, combination, and arrangement ofthe boring apparatus, as hereafter described; fifth, in the peculiarcombination and arrangement of the cords and weight for raising thesliding head, chisel-arbor, and treadle.

In the drawing, the part marked A is the `main frame; B, thedriving-shaft, to which the power is applied through the pulley B', andC, the cranlrplate, all of which are constructed and 'arran ged in theusual form and manner, and will not therefore require furtherexplanation.

The base A', upon which the main frame A rests, is made to extendfarther from the frame at the front than at the sides or rear, and hassquare projections a a at each side of the treadle D. Upon the top ofthese projections a are standards E, which support the shaft F, havingupon it two pinions, F',that mesh into racks Gr extending downward fromthe table H, and by means of which the table H is raised or lowered, andalso, in combination 4with the standards E, form a direct support forthe table from the base A.

To the end of shaft F is fixed a hand-wheel. b, by which the shaft andpinion can be turned to elevate and depress the table H. Above thisshaft is another small shaft, e, upon which are fastened dogs c'. Thesefall between the teeth of the pinions F, holding them in any desiredposition.

lVh'en the pinions are to be turned, the dogs are raised by means of ahand-lever, d, upon the end of their shaft o.

To the front of the projection a on the base A' are secured two plates,I, which are bent at a right angle, and project forward at each side ofthe treadle, as shown in the drawings, and between which the treadle Drises and falls. Holes e are made in the projecting portion ot' theseplates I, and a pin, f, inserted, againstwhich the treadle D strike-s asit rises.

By placing the pin f in the different holes the height to which thetreadle rises can be regulated.

The pin fis prevented from working out of place by a key passing throughits end.

The treadle D is made in the usual manner, being pivoted inthe interiorof the frame near the back side, and extending forward through anopening in the front of the frame A. It is connected by a rod, D', tothe bea-rings x of the driving-shaft B, and by means of which thelatter, in connection with the chisel-slide, is brought down.

One end of a cord or chain, z, is attached] by a collar, v, to thetreadle'rod D', its other end being fastened to the smallercircumference of the double-grooved pulley Z, arranged in the interiorof the main frame A, just be neath the sliding bearing x of thedrivingshaft B. To the larger circumference of said double-groovedpulley Z, at the opposite side,

from cord z, is fastened another cord, z', having attached at its lowerend a weight, D", which han gs in the interior of the main frame, asindicated in the drawings, Fig. 6.

By the above arrangement of cords, pulley, and weight, the slidingbearing, chisel-arbor, and treadle are raised when the fastening orpressure is removed from the treadle D, while at the same time a morecompact and shorter frame can be employed than would be required if thecords were suspended from the top of the frame above the sliding head.

Pivoted to the front of one of the standards E is an arm, J, extending`downward, and at its lower endis a beak, t', which passes through anopening in the plate I, across the treadle D, and is held in thatposition by the spring g, which rests against the side of the arm J. Inthis manner the treadle D is kept down without any pressure from thefoot of the operator.

The top of the beak i is beveled off, and as the treadle strikes it incoming down it moves back to let the treadle pass, after which thespring g throws it again into place.

The lower end of arm J passes through the catch-lever K, and is securedby a nut on the under side of the lever.

The catch-bar K is pivoted at its rear end to the under side of the baseA', and its forward end rests alongside, the end of the treadle D beingcurved upward, so that it is somewhat higher than the end of the treadlewhen the latter is pressed down, whereby the operator can, by turninghis foot as it rests on thc treadle D, throw back the catch-lever K, asshown in red lines, Fig. 5, which carries back the arm J and beak t',thereby allowing the treadle D to rise.

The table H is bolted to a slide, 7L, which moves up and down in groovesformed in the frame A. Upon the front of the slide h, beneath the table,are clamp-bolts k, by means of which the table H can be firmly securedat any desired height. Secured to the front of the frame A, above thetable H, are guidepieces L, between which works the chisel-slide M,being moved up and down by the rod N connected to crank-plate C. Throughprojections M on the face of the chiselslide M passes the chisel-arbor0, carrying in its lower end the chisel m. The arbor O can be turned toreverse the position of the chisel fm. by means of a handle, P,att-ached to a hub or sleeve, Gr, through which the arbor O passes, andwhich is prevented from turning on the arbor O by a pin or screw, p, inthe hub Q, the end of which runs in a longitudinal groove or channel cutin the side of the arbor O. The ends of the hub or sleeve Q t and turnin bearin gs R, which are secured to the face of the guidepieces L,extending across from 011e to the other, as indicated in the drawings.

The chisel-arbor O is retained in position by a spring, S, which isfastened to the back of the slide M, with its lower end projectingforward and resting on a cani, T, in form as shown in Fig. 4, and whichcam is secured to the arbor O. By the peculiar construction of the camTthe chisel is held firmly in position, and at the same time it offersbut little resistance when changed by the handle P, when it is swungaround to the position indicated by red lines, Figs. 3 and 4, to reversethe arbor O and chisel m. The points o on the cani T strike against thesides of the spring S, and prevent the arbor from swinging too farround.

Secured to the side of the frame A is the boring apparatus, which I willproceed to de'- scribe. To the studs Z, which project from the side ofthe main frame A, is fastened a guideframe, U, upon which flts andslides a carriage, V, furnished at its lower side with a rack, V', whichengages into a pinion, s, working upon the stud s', and connected tohandwheel W, by means of which the carriage can be moved back andforward. At the top of carriage V is a shaft, X, supported by thebearings t and 11'attached to the side of the main frame A. Upon theshaft X is placed the drivin g-pulley Y. It is held to the bearing u bymeans of a iiange which fits into a groove, y, on the hub of the pulleyY. The shaft X is so arranged that it can slide freely through thebearing u and pulley Y, the latter being provid ed with a spline to fita longitudinal groove or slot cut inthe shaft X.

At the front of carriage V are bearings 1.1, in which turns an uprightspindle, 2, so arranged that it can slide up and down with the motion ofthe hand-.lever 3, to whichit is connected by the rod 4 and collar 5, asindicated in the drawings. The lower end of. the spindle 2 is fitted toreceive the shank of the bit or auger. To the collar 5 is attached aweight, 6, by means of a cord, 7, which passes over a pulley, 8, nearthe top of the carriage V, and thence down to a hook, 9, secured to thecollar 5. A gage-collar, l0, is placed upon the spindle between thelower bearing and collar 5, which can be moved up or down to regulatethe height to which the auger rises. A movable stop, 14, is placed upona standard, 15, beneath the lever 3, which can be adjusted by a screwand hand-wheel, for regulating the depth of hole bored.

The motion is transmitted from the drivingshaft X to the upright spindle2 by means of a pair of motor-gears,l3, one of whichis Xed to the end ofthe driving-shaft X, and the other having a spline, which works in achannel in the side of spindle 2.

The operation ofthe boringapparatus is as follows: Turnv the. hand-wheelW until the auger in the end of the upright spindle is over Havingdescribed my improvements in mortising-machines, What I claim therein asnew and of my invention, and desire to secure by Letters Patent, is-

1. The employment, with the treadle D of a mortising-machine, of a catchor stop mechanism adapted to retain said treadle in its depressedposition Without the aid of the foot, substantially Vas set forth.

2. The combination of the arm J, spring g, beak z', and lever K in themanner described, the Whole constituting a catch mechanism arranged tooperate in connection With the treadle D, substantially as herein setforth.

3. The arrangement, with the main frame A, of the treadle device hereindescribed and the devices for elevating and depressing the table, asshown and described.

D. L. GIBBS.

Witnesses THos. H. DODGE, D. L. MILLER..

